Metrological characterization of the new 1MN force standard machine of NPL India

Abstract: Since November 2010, NPL India’s force scale has been complemented in the range from 10kN to 1MN by a further force standard machine. This automatically working 1MN force standard machine utilizes a lever amplification of a 100kN mass stack and enables low relative expanded uncertainties of smaller than 9×10−5 on the lever, and 2×10−5 on the deadweight side. In this paper, the constructional design of the machine is described. According to the new EURAMET Calibration Guide, a model for the uncertainties is developed. Supplementary to this, results from comparison measurements of the new NPL India machine with PTB´s force standard machines are presented. [Copyright &y& Elsevier]